Determine the intervals on which the function is (a) increasing; (b) decreasing; (c) constant. ... (a) The function is increasing on the interval(s) (Use a comma to separate answers as needed. Type your answer in interval notation.) (b) The function is decreasing on the interval(s) (Use a comma to separate answers as needed. Type your answer in interval notation.) (c) The function is constant on the interval(s). (Use a comma to separate answers as needed. Type your answer in interval notation.) -6 -4 -2 6- 4- 2- -2- -4 -6- 2 4 X 6 O